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In a multi-electron atom, which of the f...

In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?
n = 1, l = 0, m = 0
n = 2, l = 0, m = 0
n = 3, l = 2, m = 0
n = 3, l = 2 , m = 1

A

(1) and (2)

B

(2) and (3)

C

(1) and (3)

D

(3) and (4)

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